81943328326 has 16 divisors (see below), whose sum is σ = 129474201600. Its totient is φ = 38788261128.

The previous prime is 81943328309. The next prime is 81943328339. The reversal of 81943328326 is 62382334918.

It is a self number, because there is not a number n which added to its sum of digits gives 81943328326.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 694590 + ... + 803953.

It is an arithmetic number, because the mean of its divisors is an integer number (8092137600).

Almost surely, 2^81943328326 is an apocalyptic number.

81943328326 is a deficient number, since it is larger than the sum of its proper divisors (47530873274).

81943328326 is a wasteful number, since it uses less digits than its factorization.

81943328326 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1500003.

The product of its digits is 1492992, while the sum is 49.

The spelling of 81943328326 in words is "eighty-one billion, nine hundred forty-three million, three hundred twenty-eight thousand, three hundred twenty-six".